This paper contains the results of a new experimental study of two-phase specific heat at constant volume,C v , and liquid-gas coexistence of propane near the critical point. The measurements cover the temperature range from 298 K to T c and at densities from 61.88 to 480.8 kg m - 3 . The measurements were made in a high-temperature and high-pressure adiabatic constant-volume calorimeter. Uncertainties of the specific heats measurements are estimated to be less than ±2 %. The results are compared with earlier measurements. An analysis is presented of the experimental data on C v and coexisting vapor-liquid densities in the critical region of propane. The model used is that of extended scaling, as given by the modern theory of critical phenomena. The results of C v measurements have been used to calculate other thermodynamic properties on the coexistence curve.